BUILD_DIR = ./build
DISK_IMG = hd3M.img
ENTRY_POINT = 0xc0001500
AS = nasm
CC = gcc
LD = ld
LIB = -I lib/ -I lib/kernel/ -I lib/user/ -I kernel/ -I device/
ASFLAGS = -f elf 
ASBINLIB = -I boot/include/
CFLAGS = -m32 -Wall $(LIB) -c -fno-builtin -W -Wstrict-prototypes \
         -Wmissing-prototypes 
#-fno-stack-protector
LDFLAGS = -melf_i386 -Ttext $(ENTRY_POINT) -e main -Map $(BUILD_DIR)/kernel.map
OBJS = $(BUILD_DIR)/main.o $(BUILD_DIR)/init.o $(BUILD_DIR)/interrupt.o \
      $(BUILD_DIR)/timer.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/print.o \
      $(BUILD_DIR)/debug.o 

##############     MBR代码编译     ############### 
$(BUILD_DIR)/mbr.bin: boot/mbr.S mk_dir
	$(AS) $(ASBINLIB) $< -o $@

##############     bootloader代码编译     ###############
$(BUILD_DIR)/loader.bin: boot/loader.S 
	$(AS) $(ASBINLIB) $< -o $@

##############     c代码编译     ###############
$(BUILD_DIR)/main.o: kernel/main.c lib/kernel/print.h \
        lib/stdint.h kernel/init.h
	$(CC) $(CFLAGS) $< -o $@

$(BUILD_DIR)/init.o: kernel/init.c kernel/init.h lib/kernel/print.h \
        lib/stdint.h kernel/interrupt.h device/timer.h
	$(CC) $(CFLAGS) $< -o $@

$(BUILD_DIR)/interrupt.o: kernel/interrupt.c kernel/interrupt.h \
        lib/stdint.h kernel/global.h lib/kernel/io.h lib/kernel/print.h
	$(CC) $(CFLAGS) $< -o $@

$(BUILD_DIR)/timer.o: device/timer.c device/timer.h lib/stdint.h\
         lib/kernel/io.h lib/kernel/print.h
	$(CC) $(CFLAGS) $< -o $@

$(BUILD_DIR)/debug.o: kernel/debug.c kernel/debug.h \
        lib/kernel/print.h lib/stdint.h kernel/interrupt.h
	$(CC) $(CFLAGS) $< -o $@

##############    汇编代码编译    ###############
$(BUILD_DIR)/kernel.o: kernel/kernel.S
	$(AS) $(ASFLAGS) $< -o $@
$(BUILD_DIR)/print.o: lib/kernel/print.S
	$(AS) $(ASFLAGS) $< -o $@

##############    链接所有目标文件    #############
$(BUILD_DIR)/kernel.bin: $(OBJS)
	$(LD) $(LDFLAGS) $^ -o $@

.PHONY : mk_dir hd clean all

mk_dir:
	if [ ! -d $(BUILD_DIR) ];then mkdir $(BUILD_DIR);fi

mk_img:
	if [ ! -e $(DISK_IMG) ];then /usr/bin/bximage -hd=3 -mode="create"  -q $(DISK_IMG);fi

hd:
	dd if=$(BUILD_DIR)/mbr.bin of=hd3M.img bs=512 count=1  conv=notrunc
	dd if=$(BUILD_DIR)/loader.bin of=hd3M.img bs=512 count=4 seek=2 conv=notrunc
	dd if=$(BUILD_DIR)/kernel.bin \
           of=hd3M.img \
           bs=512 count=200 seek=9 conv=notrunc

clean:
	#cd $(BUILD_DIR) && rm -f ./* && rm ../$(DISK_IMG)
	@find -type f -regex ".*\.i\|.*\.o\|.*\.bin\|.*\.img\|.*\.map\|.*log\.bochsrc\.disk\|.*\.img\.lock"  -delete


build: $(BUILD_DIR)/kernel.bin $(BUILD_DIR)/mbr.bin $(BUILD_DIR)/loader.bin

all: mk_dir mk_img build hd
